Mussen Lamoh, M. ., Jackson Joy, E., Rashid, M. ., Islam, S. ., & Hashmi, S. . (2020). Biogas Production Optimization from Palm Oil Mill Effluent: Experiments with Anaerobic Reactor . International Journal of Integrated Engineering, 12(3), 261-270. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/5475